hfs: new node 0 already hashed?
------------[ cut here ]------------
1
WARNING: fs/hfs/bnode.c:520 at hfs_bnode_create+0x461/0x4f0, CPU#0: kworker/u9:2/477
Modules linked in:
CPU: 0 UID: 0 PID: 477 Comm: kworker/u9:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:hfs_bnode_create+0x461/0x4f0
Code: c7 8b 89 ee e8 c0 2f 7e fe e9 cf fc ff ff e8 f6 3a 1a ff 4c 89 ef e8 fe 48 e8 08 48 c7 c7 e0 b8 c7 8b 89 ee e8 a0 2f 7e fe 90 <0f> 0b 90 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c d6 fb ff ff
RSP: 0018:ffffc900045e6ce0 EFLAGS: 00010246
RAX: 000000000000001f RBX: ffff8881bbba2000 RCX: c9fdd73e400be300
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc900045e6a67 R09: 1ffff920008bcd4c
R10: dffffc0000000000 R11: fffff520008bcd4d R12: 0000000000000000
R13: ffff8881bbba20e0 R14: ffff88816a8a7b00 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818e09e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559412aa28 CR3: 000000016ccac000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hfs_bmap_alloc+0x5c1/0x650
 hfs_btree_inc_height+0x100/0xad0
 hfs_brec_insert+0x7ef/0xc90
 __hfs_ext_write_extent+0x2a1/0x470
 hfs_ext_write_extent+0x17e/0x210
 hfs_write_inode+0x117/0x960
 __writeback_single_inode+0x75a/0x11a0
 writeback_sb_inodes+0x944/0x1880
 wb_writeback+0x456/0xb70
 wb_workfn+0x414/0xf50
 process_one_work+0x949/0x1650
 worker_thread+0x9af/0xee0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
